Self-locking sash-lock.



ARTHUR eoEMAN, or ST. LOUIS, MISSOURI.

SELF-LOCKING sAsH-Locx.'

Specification of Letters Patent.

. Application flled.y October 31, 1907.` Serial No. I100,060.

Patented April 21, 1908.

To all whom it may concern: 1

Be it known that I, ARTHUR GORMAN, a citizen of the United States,residing at St. Louis and State of Missouri, have invented a new anduseful Self-Locking Sash-Lock, of which the followin isa specication.

The invention re ates to improvements in sash locks.

The object of the present invention is to improve the construction ofsash locks, and to provide a simple and comparatively ineX- pensive oneof great strength and durability, adapted to be readily applied to theupper and lower sashes of a window, and capable of automatically lockingthe same when the sashes are closed.

A further object of the invention is' to provide a sash lock, which,when applied to awindow, will render it impossible to 'close the sasheswithout locking the same, and which will effectually prevent a windowfrom being unlocked from the exterior by introducing the blade of aknife, or other tool between the meeting rails of the sashes.

With these and other objects in view, the invention consists in theconstruction and novel combination of parts hereinafter fully described,illustrated in the accompanying drawing, and pointed out in the claimshereto appended; 1t being understood that various changes in the form,proportion, size and minor details of constructlon, within the scope ofthe claims, may be resorted to without departing from the spirit orsacrificing any of the advantages of the invention.

In the drawing Figure 1 is a plan view of a self locking sash lock,constructed in accordance with this invention, and shown applied to awindow. Fig. 2 is a horizontal sectional view. Fig. 3 is avertical'sectional view, taken substantially on the line 3-3 of Fig. 2..Fig. 4 is a detail perspective view of the keeper and the tripping plateor member.

Fig. 5 is a detail lperspective view of the bolt. Y

Fig. 6' is a detai lsectional view of a" portion of 1the casing, showingthe rear end of the bo t.

Like numerals of reference designate corresponding parts in all thefigures of the draw- Ing.

l designates a substantially segmental casing, constructed of suitablemetal and provi ed with a detachable bottom plate 2, and

the tripping plate or4 member.

having a curved bolt opening 3, terminating at the straight edge 4 ofthe casing adjacent to the ends thereof, as clearly illustrated in Fig.2 ofthe drawing. The bottom plate is provided with projecting ears 5,and the bolt casing 1 is secured to the upper edge or top of the lowersash by means of screws, or other suitable fastening devices, thestraight edge of the casing being arranged flush with the edge of thetop rail 6, as clearly shown in Fig. 1. The opening 3 receives a curvedor arcuate bolt 7, and is enlarged at an intermediate point for thereception of a coiled spring 8, which bears against the casing andagainst the shank 9 of an operatin head or knob 10 for actuating thebolt to s ide the front end 11 of the same into a keeper 12. The rearend of the bolt is provided with a depending setting lug 13, which isadapted, whenl the rear end of the bolt is extended from the casing, toengage the latter at the bottom of the bolt opening 3, as clearlyillustrated in Fig. 6 of the drawing. This sets the bolt and holds thefront end retracted and out of engagement with the keeper.

The keeper, which is constructed of suitable material, is secured byscrews 14, or

other suitable fastening devices to the upper face of the bottom rail ofthe upper sash, and it isprovided with an extended -end portion 15 towhich a tripping plate or member 16 is pivoted. The tripping plate ormember 16 is provided at its inner end with an eye 17, and itis securedto the end portion 15 by a vertical screw 18, which forms the pivot ofThe tripping plate or vmember is adapted to oscillate horizontally, andit is held normally extended and in Hush relation with the edge of thebottom rail of the upper sash by means of a spring 19, secured at oneend to a flange 20 of the end portion of the keeper, and having its freeend bearing against a flange 21 of the tripping plate or member 16. Theanges 20 Vand 21 extend longitudinally of the bottom rail of the uppersash, and the inner end of the tripping plate or member is also rovidedwith a transversely disposed shoullder 23, which abuts against theadjacent end of the keeper to form a stop for limitin the forwardmovement of the triping p ate or member, as clearly shown in ig. 1 ofthe drawing. The outer end of the tripping plate or member has anenlargement or boss 24, arranged in the path of the rear end of thebolt, when the latter is set, and the meeting rails of the sashes areseparated and adapted, when the sashes are closed, to engage the settinglug 13 and lift the same out of engagement with the edge of the casingto permit the .coiled spring 8 to throw the bolt into engagement withthe keeper. By this construction, the sash lock is adapted to lock rthesashes of a window automatically when the same are closed. The boltopening 3 at the rear end of thebolt is sufficiently large to permit therear portion of the bolt to move vertically a distance to disengage thelug from the casing when the bolt is tripped. The shank 9 of theoperating head or knob 10 extends through a slot 25 of the top of thecasing, and the head or knob is located above the same in convenientosition for the operator to slide the bolt backward for unlocking thewindow. When the bolt is moved backward to the position shown in Fig. 2of the drawing, its rear end engages its setting and tripping device andswings the latter rearwardly to the position shown in Fig. 2. As soon asthe lower sash is raised, or the upper sash is lowered suficiently tocarry the rear end of the bolt out of engagement with the side edge ofthe tripping plate or member, the latter will be returned to its normalposition by the spring, and will extend into the path of the rear end ofthe bolt, so that it will be impossible to close the sashes withouttripping the bolt and locking the window. As the bolt, when inengagement with the keeper, extends across the adjacent edges of themeeting rails of the upper and lower sashes and is slidable backwardlyand forwardly, it will be apparent that it will be impossible to operatethe sash lock from the exterior by the blade of a knife or similar toolinserted between the sashes.

Havin thus fully described my invention, what I claim as new and desireto secure by Letters Patent, is

1. In a lock, the combination with a keeper, of a casing, a bolt movablymounted wit in the casing to project either end from vthe same, a springfor carrying one end of the bolt into engagement with the keeper, meansfor setting the bolt with its other end extended from the casing, and atripping device arranged in the path of the extended end of the boltwhen the latter is set and adapted to release the same for automaticallyengaging the keeper.

2. In a sash lock, the combination with a keeper designed to be mountedon the upper sash et a window, of a casing for attachment to the lowersash, an arcuate bolt slidable in the casing to project either end of itfrom the same, a spring for carrying one end of the bolt into engagementwith the keeper, means for setting the bolt in an extended position, andmeans lor automatically tripping th(` bolt when the sashes are closed.

3. In a sash lock, the combination with a keeper designed to be mountedon the upper sash of a window, of a casing for attachment to the lowersash, a bolt slidable in the casing to project either end of it from thesame, a spring for carrying one end of the bolt into engagement with thekeeper, the other end ol' the bolt being provided with means forcngaging the casing to set the bolt, and a tri ping device arranged inthe path oi the he t when the latter is set.

4. In a sash lock, the combination with a keeper designed to be mountedon the upper sash of a window, of' a casing for attachment to the lowersash, a bolt slidable in the casing to project either end ot it Vlromthe same, a sprmg for carrying one end of the bolt into engagement withthe keeper, the other end of the bolt being provided with a dependinglug for engaging the casing to set the bolt, and a tripping devicearranged in the path of the lug when the bolt is set and movable to andfrom such position to permit the holt to be unfastened and set while thesashcs are closed.

5. In a sash lock, the combination with a keeper, of a casing, aslidable bolt arranged to project either of its ends from the casing,one end of the bolt being provided with means for setting it, a springfor moving the other end of the bolt into engagement with the keeper, amovabl y mounted tripping device forreleasing the bolt, and a s )ringAl'or holding the tripping device normally in the path of the extendedend of the bolt when the latter is set.

6. In a sash lock, the combination et a keeper, a casing, a springactuated bolt slidable in the easing and arranged to project either ofits ends therefrom, one end being arranged to extend into the casing, alug carried by the other end of the bolt and arranged to engage thecasing for setting the bolt, a

tripping device pivoted to the keeper and provided with means to limitthe swing of the tripping device, and a spring for actuating thetripping device.

7. In 'a sash lock, the combination of a keeper, a casing, a springactuated bolt movable to project either end from the casing, one endbeing arranged to engage the keeper,

and the other end being provided with means Y end therefrom, one end ofthe bolt being In testimony, that I claim the foregoing as adapted toengage the keeper, and the other my own, I have hereto affixed mysignature 10 end being rovded With a de endirg lug for in the presenceof two Witnesses. en aoin t e easn to set t e bo t, and a 5, triptinggdevice pivgoted at one end to the ARTHUR' GORMA keeper and provided atthe other end With a Witnesses: 1u or enlargement arranged to engage theAUGUST A. WOLF, bo twhen the latter isset. OSCAR F. UHL.

